chore: move pending-release to release-notes (#3988)

Also adds a line for node operators to modify their mempool
ttl-num-blocks config

(cherry picked from commit a2f10ed)

docs/release-notes/pending-release.md

@@ -1,11 +1,7 @@
-# Pending Nelease
+# Pending Release
 
-## v3.0.0 [Unreleased]
+## v4.0.0
 
-### Node Operators
+### Node Operators (v4.0.0)
 
-- Consensus node operators should enable the BBR (Bottleneck Bandwidth and Round-trip propagation time) congestion control algorithm. See [#3774](https://github.com/celestiaorg/celestia-app/pull/3774).
-
-### Library Consumers
-
-- Namespace and share constants in the `appconsts` package were moved to [celestiaorg/go-square](https://github.com/celestiaorg/go-square). See [#3765](https://github.com/celestiaorg/celestia-app/pull/3765).
+### Library Consumers (v4.0.0)

docs/release-notes/release-notes.md

@@ -2,17 +2,32 @@
 
 This guide provides notes for major version releases. These notes may be helpful for users when upgrading from previous major versions.
 
+## v3.0.0
+
+### Node Operators (v3.0.0)
+
+- Consensus node operators must enable the BBR (Bottleneck Bandwidth and Round-trip propagation time) congestion control algorithm. See [#3774](https://github.com/celestiaorg/celestia-app/pull/3774).
+- Consensus node operators should manually configure their node's mempool `ttl-num-blocks = 12` in config.toml. An example command to do this:
+
+  ```bash
+  sed -i 's/ttl-num-blocks = 5/ttl-num-blocks = 12/' ~/.celestia-app/config/config.toml
+  ```
+
+### Library Consumers (v3.0.0)
+
+- Namespace and share constants in the `appconsts` package were moved to [celestiaorg/go-square](https://github.com/celestiaorg/go-square). See [#3765](https://github.com/celestiaorg/celestia-app/pull/3765).
+
 ## [v2.0.0](https://github.com/celestiaorg/celestia-app/releases/tag/v2.0.0)
 
-### Node Operators
+### Node Operators (v2.0.0)
 
 If you are a consensus node operator, please follow the communication channels listed under [network upgrades](https://docs.celestia.org/nodes/participate#network-upgrades) to learn when this release is recommended for each network (e.g. Mocha, Mainnet Beta).
 
 Consensus node operators are expected to upgrade to this release _prior_ to the Lemongrass hardfork if they intend to continue participating in the network. The command used to start the [consensus node](https://docs.celestia.org/nodes/consensus-node#start-the-consensus-node) or [validator node](https://docs.celestia.org/nodes/validator-node#run-the-validator-node) will accept an additional `--v2-upgrade-height` flag. See [this table](https://docs.celestia.org/nodes/network-upgrade-process#lemongrass-network-upgrade) for upgrade heights for each network.
 
 Consensus node operators should enable the BBR (Bottleneck Bandwidth and Round-trip propagation time) congestion control algorithm. See [#3812](https://github.com/celestiaorg/celestia-app/pull/3812).
 
-### Library Consumers
+### Library Consumers (v2.0.0)
 
 If you are a library consumer, a number of the Go APIs have changed since celestia-app v1.x.x. Some of the notable changes are: